From your Profile on Strava.com, click on the Heatmaps tab to get started:

3. Click View to see your Heatmap. Move to a region or zoom in to share that particular Heatmap via Facebook and Twitter. Share the URL with a smaller group of friends via email.

You can create up to 10 Heatmaps at a time. Generate an all-time view of the year and compare it to years prior, or set custom date ranges for your Heatmap.

Only public runs and rides will be included in your Heatmaps, and any runs or rides within any privacy zones you've set will be hidden from your Heatmaps. Your Heatmaps can only be seen by you unless they are shared.